The word "future" is a noun. Nouns don't have a past tense. Verbs are the only parts of speech to have a past tense.
past tense is got future tense is will get
Am, is, and are are present tense forms of be. The past tense forms of be are was and were. The future tense of be is will be.
Past tense - accelerated. Future tense - will accelerate.
The past tense is "surrounded" The future tense is "will surround"
Past tense - grew. Future tense - will grow.
Past tense - went. Future tense - will go.
The past tense is rained. The future tense is will rain.
The past tense is received.The future tense is will receive.
Dropped is the past tense, and will drop is the future tense.
Stop is neither future tense nor past tense. It's present tense. The future tense is will stop, and the past tense is stopped.
Some examples: Past tense - worked. Future tense - will work. Past tense - played. Future tense - will play. Past tense - lied. Future tense - will lie.
"will be" is the future tense of "be". The past tense of "be" is "was/were".